/*
 * 	<pre>
 *	EasyPeas.
 *  Copyright (C) 2007 S Owen
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 * 
 * Jul 24, 2007
 * MappingsFactory.java
 * </pre>
 */
package org.easypeas.mappings;

import java.io.IOException;
import java.net.URL;

import org.easypeas.mappings.annotated.AnnotatedMappings;

/**
 * Instantiates the mappings according to the processed URL. <br>
 * Currently only {@link AnnotatedMappings} are defined.
 * 
 * @see AnnotatedMappings
 * @author S Owen
 * 
 */
public class MappingsFactory {
	@SuppressWarnings("unused")

	private static MappingsFactory instance = new MappingsFactory();

	private Mappings mappings;

	/**
	 * Instantiates a new MappingsFactory. Private to enforce use of the
	 * getInstance method
	 */
	private MappingsFactory() {
		
	}

	/**
	 * Gets the single instance of MappingsFactory.
	 * 
	 * @return single instance of MappingsFactory
	 */
	public static MappingsFactory getInstance() {
		return instance;
	}

	/**
	 * Returns a {@link Mappings} implementation, which processes a
	 * configuration file pointed to by the URL.<br>
	 * Currently the only implementation of this is {@link AnnotatedMappings}
	 * 
	 * @param url
	 *            the url
	 * 
	 * @return the mappings
	 * 
	 * @throws IOException
	 *             Signals that an I/O exception has occurred.
	 */
	public Mappings mappings(URL url) throws IOException {
		if (mappings == null) {
			mappings = new AnnotatedMappings(url);
		}
		return mappings;
	}

}
